181. The input impedance of a short circuited quarter wave long transmission line is—

1. 1. Purely reactive

   
   
   

   2. Purely resistive

   
   
   

   3. Dependent on the characteristic impedance of the line

   
   
   

   4. None of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   ∮ H· dl = 3 | + 2 | – | = 4 |

   Correct Option: D

   ∮ H· dl = 3 | + 2 | – | = 4 |

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182. The propagation of TE₁₀ mode in a rectangular waveguide is used to excite a circular waveguide as shown in figure I and figure II. The mode excited in
     the circular waveguide of figure I and figure II will be respectively—
     

1. 1. TE₁₁ and TM₀₁

   
   
   

   2. TM₀₁ and TE₁₁

   
   
   

   3. TE₀₁ and TM₀₁

   
   
   

   4. TM₀₁ and TE₀₁
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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183. The input impedance of a λ 8 long short-circuited section of a lossless transmission line is—

1. 1. Zero

   
   
   

   2. Inductive

   
   
   

   3. Capacitive

   
   
   

   4. Infinite

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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184. A 3 µF capacitor is charged by a constant current of 2 µA for 6 seconds. The voltage across the capacitor at the end of charging will be—

1. 1. 3 V

   
   
   

   2. 4 V

   
   
   

   3. 6 V

   
   
   

   4. 9 V

   
   
   

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1. View Hint View Answer Discuss in Forum

   V =	q	=	it	=	2 × 10−6 × 6	= 4V
   	C		C		3 × 10−6

   Correct Option: B

   V =	q	=	it	=	2 × 10−6 × 6	= 4V
   	C		C		3 × 10−6

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185. A positive charge of Q coulomb is located at point A (0, 0, 3) and a negative charge of magnitude Q coulomb is located at point B (0, 0, – 3). The electric field intensity at point C (4, 0, 0) is in the—

1. 1. Negative x-direction

   
   
   

   2. Negative z-direction

   
   
   

   3. Positive x-direction

   
   
   

   4. Positive z-direction

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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